This is a note to let you know that I've just added the patch titled hwrng: exynos - Fix runtime PM imbalance on error to the 5.12-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: hwrng-exynos-fix-runtime-pm-imbalance-on-error.patch and it can be found in the queue-5.12 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 37add58b83d3f31a96c40f32cbb4bb523387eb09 Author: Å?ukasz Stelmach <l.stelmach@xxxxxxxxxxx> Date: Wed May 5 20:29:14 2021 +0200 hwrng: exynos - Fix runtime PM imbalance on error [ Upstream commit 0cdbabf8bb7a6147f5adf37dbc251e92a1bbc2c7 ] pm_runtime_resume_and_get() wraps around pm_runtime_get_sync() and decrements the runtime PM usage counter in case the latter function fails and keeps the counter balanced. Signed-off-by: Å?ukasz Stelmach <l.stelmach@xxxxxxxxxxx> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxxxxx> Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/char/hw_random/exynos-trng.c b/drivers/char/hw_random/exynos-trng.c index 8e1fe3f8dd2d..c8db62bc5ff7 100644 --- a/drivers/char/hw_random/exynos-trng.c +++ b/drivers/char/hw_random/exynos-trng.c @@ -132,7 +132,7 @@ static int exynos_trng_probe(struct platform_device *pdev) return PTR_ERR(trng->mem); pm_runtime_enable(&pdev->dev); - ret = pm_runtime_get_sync(&pdev->dev); + ret = pm_runtime_resume_and_get(&pdev->dev); if (ret < 0) { dev_err(&pdev->dev, "Could not get runtime PM.\n"); goto err_pm_get; @@ -165,7 +165,7 @@ err_register: clk_disable_unprepare(trng->clk); err_clock: - pm_runtime_put_sync(&pdev->dev); + pm_runtime_put_noidle(&pdev->dev); err_pm_get: pm_runtime_disable(&pdev->dev);